Intramesolimbic Exendin-4 Administration
Objective: Determine the neurobiological substrates of GLP-1-mediated food reward suppression by assessing the impact of intramesolimbic Exendin-4 administration on food reward behavior using conditioned place preference and progressive ratio operant-conditioning paradigms
This is a Intramesolimbic Exendin-4 Administration protocol using rat as the model organism. The procedure involves 5 procedural steps, 2 equipment items, 3 materials. Extracted from a 2012 paper published in Journal of Neuroscience.
Model and subjects
rat • Not specified • unknown • Not specified • Not specified
Study window
Estimated timing pending
Core workflow
Peripheral Exendin-4 Administration and CPP Testing • Peripheral Exendin-4 Administration and Progressive Ratio Testing • Central Exendin-4 Administration
Primary readouts
- Preference for environment paired with chocolate pellets in CPP test
- Motivated behavior for sucrose in progressive ratio operant-conditioning paradigm
- Presence or absence of malaise
- Locomotor activity
Key equipment and reagents
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Protocol Steps
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Peripheral Exendin-4 Administration and CPP Testing
Administer Exendin-4 peripherally and assess impact on food-reward behavior using conditioned place preference test with chocolate pellets as reward stimulus
Note: This establishes baseline effect of EX4 on food reward
View evidence from paper
“Food-reward behavior was reduced in the CPP test by EX4, as rats no longer preferred an environment previously paired to chocolate pellets”
Peripheral Exendin-4 Administration and Progressive Ratio Testing
Administer Exendin-4 peripherally and measure motivated behavior for sucrose using progressive ratio operant-conditioning paradigm
Note: Demonstrates EX4 effect on food motivation
View evidence from paper
“EX4 also decreased motivated behavior for sucrose in a progressive ratio operant-conditioning paradigm when administered peripherally”
Central Exendin-4 Administration
Administer Exendin-4 centrally to determine if food-reward suppression is mediated through central GLP-1 receptors
Note: Establishes central mediation of EX4 effects via GLP-1 receptors
View evidence from paper
“We show that this effect is mediated centrally, via GLP-1 receptors (GLP-1Rs)”
Intramesolimbic Exendin-4 Administration - Ventral Tegmental Area
Administer Exendin-4 directly into the ventral tegmental area and assess effects on food reward behavior
Note: Identifies ventral tegmental area as a key mesolimbic substrate for EX4-mediated food reward suppression
View evidence from paper
“We found that the EX4-mediated inhibition of food reward could be driven from two key mesolimbic structures—ventral tegmental area and nucleus accumbens”
Intramesolimbic Exendin-4 Administration - Nucleus Accumbens
Administer Exendin-4 directly into the nucleus accumbens and assess effects on food reward behavior
Note: Identifies nucleus accumbens as a key mesolimbic substrate for EX4-mediated food reward suppression without inducing malaise or locomotor impairment
View evidence from paper
“We found that the EX4-mediated inhibition of food reward could be driven from two key mesolimbic structures—ventral tegmental area and nucleus accumbens—without inducing concurrent malaise or locomotor impairment”